Syrian opposition sources believe soldiers linked to a horrific 2013 massacre committed by the Assad regime in the Damascus suburb of Tadamon, revealedon Wednesday, could be eliminated. An opposition official said the regime would kill its own officers and soldiers following The Guardian’s release of a video of the massacre, which saw dozens shot dead in cold blood. Footage of the massacre, which was smuggled out of Syria by a defecting Assad regime militia recruit, showed an intelligence officer forcing blindfolded and bound captives to run across a street before shooting them dead and later …